Adjustable scaffold



Aug. 14, 1934. N, IGNAC 1,970,229

ADJUSTABLE S CAFFOLD Filed April 8, 1932 v/17 Venfor /Va/Jo/eon Gly/7a: 1:/ n

Patented Aug. 14, 1934 Napoleon Gignac, Mo

ntreal, Quebec, Canada Application April 8, 1932, Serial No. 604,089

In Canada 2 Claims.

The present invention relates to improvements in adjustable scaffolds, and the main object is to provide an apparatus of this character which is easy and safe to operate when the workmen are at work, and which is of simple construction and particularly cheap of manufacture.

The invention consists broadly of two or more shafts disposed horizontally, each of which are held at their rear end in a suitable bearing which is secured to the roof of a building or any suitable support. The shafts are also suitably supported, about midway, upon a bracket located adjacent the edge of the roof of said building or support, the opposite ends of said shafts extending beyond the side of said building and each provided with two drum sections secured thereto, suitably distanced from one another, and upon which roll or unroll the ends of the lifting cables. The other ends of said cables extend downwards and are secured to a cross-bar supporting the scaffold which consists of planks forming a platform upon which the workmen stand when working. Upon the rear end of said shafts is located the hoisting mechanism, thereby making this scaffold operable from the roof of a building or any other suitable support, and thus eliminating the usual hoisting cables which are operated from the scaffold platform.

In the accompanying drawing;

Figure 1 is a side elevation view of a device according to this invention; the support in this case being the roof of a building and wall therefor which are shown in section; and

Figure 2 is an end View of Figure 1, showing the hoisting mechanism provided upon the end of the horizontal shaft.

Like numerals of reference indicate corresponding parts in each figure.

Referring to the drawing, l indicates any suitable support, here disclosed as a wall of a building and the roof or if preferred one of the iioors 2. Upon the roof or floor 2 is preferably mounted the scaffold hoisting mechanism which consists of two or more horizontal shafts 3, each rotatively mounted at one end in the bearing a, fixedly secured to the roof by means of an inverted U-shape bracket 5, the ends of which pass through suitable holes provided in the roof which are secured therein by any suitable means. The shafts 3 pref- I erably extend beyond the edge 6 of the building and 7 is a supporting bracket for each of said shafts, said bracket being located intermediate of the length of said shafts upon which they revolve.

On the outer end of said shafts which extend April 8, 1931 beyond the side of the building is preferably provided two pairs of guide disks 8, suitably spaced from one another, so as to form channels or pathways for the lifting cables 9 and 10. These cables are securely fastened, at one end to said shafts in any suitable manner and roll or unroll between said guide disks. The other ends of said cables are preferably secured to each end of the crossbar l1, which is adapted to support the platform 65 There should be at least two horizontal shafts To raise or lower the platform 12, a simple A,

hoisting mechanism is provided at the end of each of said shafts 3 (see Figure 2 of the drawing) 1t preferably consists of a sleeve 13, preferably carrying an integral dented wheel 14, said sleeve fitting over the end of the shaft 3 and xedly secured thereto by means of the bolts 15. in said sleeve 13 is provided one or more holes 16, through which is inserted a rod 16a, by means of which the shaft 3 is rotated. When the said shaft has been rotated, to adjust the scaffold platform at the required height, a pawl 17 is operated, by means of the handle 18, to engage the dented Wheel 14, and thus lock said shaft in fixed position. To unlock said shaft, the pawl 17 is pulled out of engagement with the said dented wheel.

It should be readily understood that only a preferred form of the invention is herein described and disclosed, and that modifications may be made without departing from the spirit and scope of the following claims of novelty.

What 1 claim as my invention is:

1. A scaffold, in combination with an adjustable platform and a support therefor, comprising a plurality of bearings mounted upon said support and suitably secured thereto, a plurality of shafts horizontally disposed in relation to said support, one end of each of which extend beyond said support and the other ends being rotatively mounted in each of said bearings, hoisting cables secured at one end thereof to adjacent the ends of the shafts extending beyond said support and suitably distanced from one another, the other ends of said. hoisting cables being secured to said platform, means upon said shafts located adjacent said bearings to rotate each of said shafts, thus causing said cables to roll upon or unroll from said shafts, whereby, said platform will be raised or lowered, means mounted upon said shafts to lock same from rotation, and supporting means for said shafts mounted upon said support and disposed intermediate of the length of said shafts.

2. A scaffold, in combination with an adjustable platform and a support therefor, comprising a plurality of bearings mounted upon said support and suitably secured thereto, a plurality of shafts horizontally disposed in relation to said support, one end of each of which extend beyond said support and the other ends being rotatively mounted in each of said bearings, hoisting cables suitably distanced from one another sev cured at one end thereof to adjacent the ends of each of said shafts extending beyond said sup- NAPOLEON GIGNAC. 

